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Health analysis of white and colored cotton seeds under different treatment during storage. = Análise sanitária em sementes de algodoeiro branco e colorido submetidas a diferentes tratamentos durante o armazenamento.
Vicente de Paula Queiroga,Josivanda Palmeira Gomes de Gouveia,Lílian Batista de Queiroz,Diego Antonio Nóbrega Queiroga
Agro@mbiente On-line , 2011,
Abstract: We studied the effectiveness of different treatment processes applied to the seeds of herbaceous cotton, BRS Verde and CNPA 7H, compared with lint seeds (control) in order to reduce the incidence of fungi, particularly on seeds stored in dry chamber. We adopted delineation completely randomized, using the factorial scheme 2 x 3 x 3, with four replications, being the factors: two cultivars (white and colored cotton), three treatments (C/L, S/L and S/L + T), and three storage periods (zero, 6 and 12 months). Based on the results, it was concluded that the fungal treatment applied to the seeds lint was effective in reducing the infestation of fungi, and BRS 7H is less contaminated during the storage period.
Efeito da temperatura sobre a germina??o de três espécies de Pinus cultivadas no Brasil
Almeida, Francisco de Assis Cardoso;Rodrigues, Joaquim Pereira;Almeida, Silvana Alves de;Gouveia, Josivanda Palmeira Gomes de;Santos, Nilene Rodrigues dos;
Revista árvore , 2005, DOI: 10.1590/S0100-67622005000500011
Abstract: the pinus species present a high level of resistance to forest fires, being considered as active pyrofit plants. for this reason a question is raised: did the seed behavior of these species develop exclusively due to fire disturbances or by other causes that have influenced this process?, still, did these species develop similar adaptable answers? to answer these questions, seeds of three species of pinus species were exposed to different thermal intensities and time of exposition, in order to simulate responses to the different fire regimes, evaluating the effects of high temperatures on the seeds, as well as the effect of ashes, as the most notable element of the micro-environment in which the plants should grow later. the used plant material was acquired from ipef (researches and forest studies institute) - piracicaba, sp. to evaluate seed responses to the temperatures, an entirely randomized statistical design with factorial arrangement was used. in the absence of thermal treatments, the seeds presented high germination rates and strong reduction in temperatures equal or superior to 70 oc, suggesting that they are not really active pyrofit plants. the germination values obtained with temperature equal to 50 oc differed statistically from the control, and when the temperature values were equal or superior to 110 oc, an important germination reduction occurred in all treatments. the simultaneous evaluation for heat and ashes showed the existence of an interaction between the factors, with total inhibition of germination in some treatments.
An empiric equation for the latent heat of vaporization of moisture in bananas during its isothermal drying  [PDF]
Wilton Pereira da Silva, Cleide Maria Diniz Pereira da Silva e Silva, Fernando José de Almeida Gama, Josivanda Palmeira Gomes
Agricultural Sciences (AS) , 2012, DOI: 10.4236/as.2012.32025
Abstract: In order to determine the energy needed to artificially dry a product, the latent heat of vaporization of moisture in the product, hfg, must be known. Generally, the expressions for hfg reported in the literature are of the form hfg = h(T)f(M), where h(T) is the latent heat of vaporization of free water, and f(M) is a function of the equilibrium moisture content, M. But expressions of this type contain a simplification because, in this case, the ratio hfg/h would only depend to the moisture content. In this article a more general expression for the latent heat of vaporization, namely hfg = g(M,T), is used to determine hfg for banana. To this end, a computer program was developed which fits automatically about 500 functions, with one or two independent variables, imbedded in its library to experimental data. The program uses nonlinear regression, and classifies the best functions according to the least reduced chi-square. A set of executed statistical tests shows that the generalized expression used in this work given by hfg = g(M,T) produces better results of hfg for bananas than other equations found in the literature.
Osmotic Dehydration of Pineapple Stems in Hypertonic Sucrose Solutions  [PDF]
Ronaldo dos Santos Falc?o Filho, Rennan Pereira de Gusm?o, Wilton Pereira da Silva, Josivanda Palmeira Gomes, Edvaldo Vasconcelos Carvalho Filho, Anoar Abbas El-Aouar
Agricultural Sciences (AS) , 2015, DOI: 10.4236/as.2015.69088
Abstract: The present study provides the evaluation in the influence of the variables: temperature (T), concentration of the osmotic solution (C) and ratio of fruit and osmotic solution (F:OS) during the osmotic dehydration of slices of pineapple stem variety Perola, on the responses: water loss (WL), mass loss (ML), gain of solids (GS) and ratio of gain of solids and water loss (GS/WL). The centesimal composition was determined both in the raw material and in the dehydrated product. To optmize the process, the studied factors were: temperature (T), with factorial points -1 equal to 30°C and +1 equal to 50°C; concentration of sucrose solution (C), with factorial points -1 equal to 40 g·100 g-1 and +1 equal to 60 g·100 g-1 and ratio of fruit and osmotic dehydration solution (F:OS), with factorial points -1 and +1 equal to 1:20 and 3:20, respectively. In all essays, the dehydration time was 4 hours. The essays showed that F:OS was not significant in any responses; the models adopted were predictive and fitted for WL and ML, and reasonable for GS and GS/WL. The temperature was the most significant variable in the process; the optimized values were: T= 50°C, C = 40 g 100 g-1 e F:OS = 3:20. The product needs a complementary drying to adapt itself to the legislation demands.
Isotermas de dessor o da casca do maracujá (Passiflora edulis Sims): determina o experimental e avalia o de modelos matemáticos
Oliveira Marinévea Medeiros de,Campos Ana Regina Nascimento,Dantas José Pires,Gomes Josivanda Palmeira
Ciência Rural , 2006,
Abstract: A produ o de proteínas microbianas sobre a casca de maracujá visando à produ o de suplemento protéico para animais é uma alternativa encontrada para o grande desperdício desse resíduo agroindustrial. Através das isotermas de dessor o da casca do maracujá, foi verificado que as condi es de umidade inicial para o crescimento de microrganismos neste resíduo por meio da fermenta o semi-sólida deverá ser acima de 55% (base úmida) e a faixa de umidade ideal para o armazenamento do resíduo em torno de 5,3% (base úmida).
Viabilidade de sementes de feij o macassar tratadas com extrato vegetal e acondicionadas em dois tipos de embalagens = Viability of Vigna unguiculata bean seeds treated with vegetable extract and conditioned in two types of packaging
Francisco de Assis Cardoso Almeida,Maria de Fátima Bezerra Soares Cavalcanti,Jo?o Felinto dos Santos,Josivanda Palmeira Gomes
Acta Scientiarum : Agronomy , 2009,
Abstract: Objetivou-se com o presente trabalho estudar a perda de viabilidade das sementes de duas variedades de Vigna unguiculata, acondicionadas em embalagens de papel e recipiente metálico, armazenados em ambiente n o controlado. Após a colheita das sementes, em campos preparados para esta finalidade, as mesmas foram beneficiadas manualmente, tratadas, acondicionadas e armazenadas, para que a cada dois meses fossem avaliadas quanto a sua qualidade fisiológica mediante teste de germina o, indicando a melhor capacidade armazenadora para a condi o do estudo. A análise dos dados foi realizada no delineamento inteiramente casualizado, disposto em esquema fatorial 2 x 2 x 2x 6 com 4 repeti es, sendo os fatores quantitativos revelados pela regress o na análise de variancia. De acordo com os resultados obtidos, a viabilidade das sementes de feij o Vigna unguiculata foi afetada pelos tratamentos e condi o do armazenamento, tendo ao final de 360 dias a germina o passada de 99,37 para 41,68%; a variedade Emepa foi superior a Corujinha em 63,47% e o extrato de Piper nigrum revelou-se eficiente na manuten o da viabilidade dessas sementes. The objective of this work was to study the loss of seed viability of two varieties of Vigna unguiculata, conditioned in paper andmetallic packaging, and stored without temperature and relative air humidity control. After seed harvest, in fields prepared for this purpose, the seeds were manually processed, treated, conditioned and stored; every two months, their physiological quality was evaluated using a germination test. The data analysis was carried out using an entirely randomized design, in a 2 x 2 x 2 x 6 factorial scheme with four repetitions; the quantitative factors were disclosed by the regression in the analysis of variance. Based on the results, the viability of the Vigna unguiculata bean seeds was affected by the treatments and storage condition: after 360 days, the germination rate decreased from 99.37 to 41.68%; the ‘Emepa’ variety was higher than the ‘Corujinha’ by 63.47%, and the Piper nigrum extract proved efficient in the viability maintenance of these seeds.
Isotermas de dessor??o da casca do maracujá (Passiflora edulis Sims): determina??o experimental e avalia??o de modelos matemáticos
Oliveira, Marinévea Medeiros de;Campos, Ana Regina Nascimento;Dantas, José Pires;Gomes, Josivanda Palmeira;Silva, Flávio Luiz Honorato da;
Ciência Rural , 2006, DOI: 10.1590/S0103-84782006000500045
Abstract: the microbial protein production on passion fruit peel shell as an animal protein supplement production is an alternative found out to avoid the large wastage of agri-industrial residues. through the desorption isotherms of passion fruit peel, it is verified that for the microorganism growth by solid-state fermentation on this residue, the initial moisture content condition should be above 55% (wet basis). the ideal moisture content range for residue storage is around 5.3% (wet basis).
Característica higroscópica e termodinamica do coentro desidratado
Silva, Adriano Sant'Ana;Almeida, Francisco de Assis Cardoso;Alves, Niédja Marizze Cezar;Melo, Karla dos Santos;Gomes, Josivanda Palmeira;
Revista Ciência Agron?mica , 2010, DOI: 10.1590/S1806-66902010000200010
Abstract: the determination of adsorption isotherms of moisture is an essential factor in the projects and studies of systems for drying, processing, storage, packaging and shelf-time prediction of food products. the adsorption isotherms are obtained by means of variation of moisture content in terms of equilibrium water activity at a constant temperature, and its prediction is performed by the application of mathematical models to experimental data. through the adsorption isotherms it can be calculated some thermodynamic properties such as isosteric heat of adsorption, which is used in the analysis, development of case study of food and moisture-solid interactions. thus, this work aimed to study the behavior of adsorption isotherms of leaves and stems of dehydrate coriander, evaluate the model that represents the behavior of the curves and determine the isosteric heat of adsorption. the experimental data were fitted by nonlinear regression, the gab, oswin, smith, bet, halsey and peleg models had been used. the models which best represented the behavior of the adsorption curves of the leaf and stem were from smith and peleg. the isosteric heat of adsorption obtained from dried leaf is larger than the stem.
Chemical Composition of the Cashew Apple Bagasse and Potential Use for Ethanol Production  [PDF]
Flávia Cristina dos Santos Lima, Flávio Luiz Honorato da Silva, Josivanda Palmeira Gomes, José Mariano da Silva Neto
Advances in Chemical Engineering and Science (ACES) , 2012, DOI: 10.4236/aces.2012.24064
Abstract: On the world scene, the energy requirements are mainly based on fossil fuels, however, these compounds reserves are finite and their exploitation has caused serious environmental problems. As a consequence, the demand for alternative renewable sources has been intensified in substitution the rising demand for energy and raw materials. The biomass is emerging as one of the few sources that have potential to meet these challenges of sustainability, as is currently the largest energy resource in the world, and only carbon-rich material available on the planet, apart from fossils. Form, the cashew crop has great potential for technological development of alternative sources of energy, from its industrial waste processing cashew adding value to the product. In this sense, this paper aims to study the characterization of the cashew apple bagasse and to verify (by acid prehydrolysis) the potential of this material for ethanol production. Initially it was carried out physicochemical characterization of cashew bagasse used (pH, moisture content, soluble solids, sugars, cellulose, hemicellulose and lignin). Following it was carried prehydrolysis at 105℃ for 1h to obtain fermentable sugars. Analyses of the samples were carried out on HPLC the results showed the saccharification of biomass with glucose (1537.49 mg/L), xylose (3823.22 mg/L) and arabinose (7131.11 mg/L) as well as the capacity of the biomass for ethanol production.
Diffusion models for the description of seedless grape drying using analytical and numerical solutions  [PDF]
Wilton Pereira da Silva, Cleide Maria Diniz Pereira da Silva e Silva, Jürgen Wolfgang Precker, Josivanda Palmeira Gomes, Pedro Luiz Nascimento, Laerson Duarte da Silva
Agricultural Sciences (AS) , 2012, DOI: 10.4236/as.2012.34065
Abstract: This article compares diffusion models used to describe seedless grape drying at low temperature. The models were analyzed, assuming the following characteristics of the drying process: boundary conditions of the first and the third kind; constant and variable volume, V; constant and variable effective mass diffusivity, D; constant convective mass transfer coefficient, h. Solutions of the diffusion equation (analytical and numerical) were used to determine D and h for experimental data of seedless grape drying. Comparison of simulations of drying kinetics indicates that the best model should consider: 1) shrinkage; 2) convective boundary condition; 3) variable effective mass diffusivity. For the analyzed experimental dataset, the best function to represent the effective mass diffusivity is a hyperbolic cosine. In this case, the statistical indicators of the simulation can be considered excellent (the determination coefficient is R2 = 0.9999 and the chi-square is χ2 = 3.241 × 10–4).
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